Morphological, structural, and magnetic characterizations of hard-soft ferrite nanocomposites synthesized via pulsed laser ablation in liquid

Abstract

Green pulsed laser ablation in liquid (PLAL) method was employed to synthesize the nanocomposites of SrGd0.03Fe11.97O19 (hard), and CoTm0.01Tb0.01Fe1.98O4 (soft) with different ratios by the application of a pulsed laser beam. The structural and morphological were carried out using XRD, SEM, TEM, and the observed magnetic behavior is elucidated in the light of these results. The magnetic hysteresis loop of the composite was found to be the convolution of the individual hysteresis loops of hard and soft magnetic materials at 300 and 10 K. This result along with the switching field distribution (SFD) plots at both temperatures revealed that the dipolar interaction between the hard-hard and soft–soft grains are more dominant than the exchange coupling interaction between the hard and soft grains. The saturation magnetization and remanent magnetization at both temperatures decreased with the increase of spinel ferrite content, whereas the coercive field increased with the increase of spinel ferrite content at low temperature.